Wayland surface units (Re: [PATCH 2/2] protocol: Support scaled outputs and surfaces)
On Wed, 22 May 2013 10:12:00 +0200 Alexander Larsson wrote: > On tis, 2013-05-21 at 20:57 +0300, Pekka Paalanen wrote: > > > We use the units of "pixels" in the surface coordinate system, even > > if they do not correspond exactly to any "real" pixels like > > elements in a buffer or on screen. > > Actually this is sort of a problem. Maybe the docs would be clearer if > we just used a different name for these? "points"? That is a good idea, but choosing a name is hard. I think points will get too easily confused with font sizes or the 1/72 inches unit and all that mess. Follow Android with "dp"? http://developer.android.com/guide/topics/resources/more-resources.html#Dimension I'm not sure that is exactly the definition we want to use, with just 160 dpi changed to 96 dpi. I feel uneasy mentioning dpi at all. So maybe not "dp", then. We need a name for the surface length unit, since the surface local coordinate system is such a central concept in Wayland. I just can't seem to come up with anything serious. - wayland units, wu - wayland pixels, wp, wpx - surface units, su - surface unit pixels, sux - surface pixels, sp, spx - wayland surface units, wsu - wayland atomic units, wau - pips, pip ehhh... Cheers, pq ___ wayland-devel mailing list wayland-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/wayland-devel
Re: Wayland surface units (Re: [PATCH 2/2] protocol: Support scaled outputs and surfaces)
On ons, 2013-05-22 at 12:11 +0300, Pekka Paalanen wrote: > On Wed, 22 May 2013 10:12:00 +0200 > Alexander Larsson wrote: > > > On tis, 2013-05-21 at 20:57 +0300, Pekka Paalanen wrote: > > > > > We use the units of "pixels" in the surface coordinate system, even > > > if they do not correspond exactly to any "real" pixels like > > > elements in a buffer or on screen. > > > > Actually this is sort of a problem. Maybe the docs would be clearer if > > we just used a different name for these? "points"? > > That is a good idea, but choosing a name is hard. I think points will > get too easily confused with font sizes or the 1/72 inches unit and all > that mess. > > Follow Android with "dp"? > http://developer.android.com/guide/topics/resources/more-resources.html#Dimension > > I'm not sure that is exactly the definition we want to use, with just > 160 dpi changed to 96 dpi. I feel uneasy mentioning dpi at all. So > maybe not "dp", then. Yeah, i'd rather have it disconnected from some physical notion of size. > We need a name for the surface length unit, since the surface local > coordinate system is such a central concept in Wayland. > > I just can't seem to come up with anything serious. > - wayland units, wu > - wayland pixels, wp, wpx > - surface units, su > - surface unit pixels, sux > - surface pixels, sp, spx > - wayland surface units, wsu > - wayland atomic units, wau > - pips, pip > ehhh... Yeah, names are hard. But "sux" is awesome! Other alternatives: - compositor units, cu - pels, pel - dots, dot - surface element, surfel, sel none of these are great either... ___ wayland-devel mailing list wayland-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/wayland-devel
Re: Wayland surface units (Re: [PATCH 2/2] protocol: Support scaled outputs and surfaces)
On ons, 2013-05-22 at 11:42 +0200, Alexander Larsson wrote: > On ons, 2013-05-22 at 12:11 +0300, Pekka Paalanen wrote: > > - wayland units, wu > > - wayland pixels, wp, wpx > > - surface units, su > > - surface unit pixels, sux > > - surface pixels, sp, spx > > - wayland surface units, wsu > > - wayland atomic units, wau > > - pips, pip > > ehhh... > > Yeah, names are hard. But "sux" is awesome! > > Other alternatives: > - compositor units, cu > - pels, pel > - dots, dot > - surface element, surfel, sel > > none of these are great either... For the record, Microsoft uses "DIP", for Device-independent-pixels, and Apple uses "Points" for the non-hardware coordinates (in the app level APIs). ___ wayland-devel mailing list wayland-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/wayland-devel
Re: Wayland surface units (Re: [PATCH 2/2] protocol: Support scaled outputs and surfaces)
On Wed, 22 May 2013 11:50:31 +0200 Alexander Larsson wrote: > On ons, 2013-05-22 at 11:42 +0200, Alexander Larsson wrote: > > On ons, 2013-05-22 at 12:11 +0300, Pekka Paalanen wrote: > > > > - wayland units, wu > > > - wayland pixels, wp, wpx > > > - surface units, su > > > - surface unit pixels, sux > > > - surface pixels, sp, spx > > > - wayland surface units, wsu > > > - wayland atomic units, wau > > > - pips, pip > > > ehhh... > > > > Yeah, names are hard. But "sux" is awesome! > > > > Other alternatives: > > - compositor units, cu > > - pels, pel > > - dots, dot > > - surface element, surfel, sel > > > > none of these are great either... > > For the record, Microsoft uses "DIP", for Device-independent-pixels, and > Apple uses "Points" for the non-hardware coordinates (in the app level > APIs). And we have no well-known equivalent in the FOSS or Linux world? DIP would sound fine otherwise, except Microsoft seems to tie it to the physical units via dpi again. Meh. "pel" sounds nice... - pq ___ wayland-devel mailing list wayland-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/wayland-devel
Re: Wayland surface units (Re: [PATCH 2/2] protocol: Support scaled outputs and surfaces)
On ons, 2013-05-22 at 13:01 +0300, Pekka Paalanen wrote: > > For the record, Microsoft uses "DIP", for Device-independent-pixels, and > > Apple uses "Points" for the non-hardware coordinates (in the app level > > APIs). > > And we have no well-known equivalent in the FOSS or Linux world? Not that I know of. > DIP would sound fine otherwise, except Microsoft seems to tie it to the > physical units via dpi again. Meh. > > "pel" sounds nice... pel is from "Picture ELement", and was historically used equivalently to "pixel". But "pixel" won that fight and nobody remembers "pel". So, by now we can probably use them as two not-quite-equivalent units without risking confusion. ___ wayland-devel mailing list wayland-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/wayland-devel
